Nathan Shively-Sanders be0fcd5174
Array.concat now takes ConcatArray, not ReadonlyArray (#21462)
* Overloads in Array.concat now handle ReadonlyArray

Previously it was union types, which is slower.

* Make arrayConcat3 test stricter

* Switch to InputArray instead of adding overloads

* Update baselines

* Update baselines correctly

* Rename to ConcatArray and add slice method

Should make it, respectively, easier to understand this specific type
and harder to satisfy it by mistake.
2018-02-02 13:20:40 -08:00
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